How to query Powershell cmdlet parameter values - powershell

Question

How can I get a list possible values of cmdlet parameter programmatically?
E.g for New-Item -Type:
File
Directory
SymbolicLink
Junction
HardLink

Answer 1

Get-Help New-Item -Full
Get-Command New-Item | select *
You can also check the online documentation (e.g. New-Item).
Or you can use
(Get-Command -Name new-item).parametersets
as suggested by vonPryz above.
For "Get-" cmdlets I usually create an object and then do a Get-Member to retrieve the definition of the members.
e.g.
$item = Get-Item .\test.csv
$item | Get-Member
TypeName: System.IO.FileInfo
Name MemberType Definition
---- ---------- ----------
LinkType CodeProperty System.String LinkType{get=GetLinkType;}
Mode CodeProperty System.String Mode{get=Mode;}
Target CodeProperty System.Collections.Generic.IEnumerable`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] Target{get=GetTarget;}
AppendText Method System.IO.StreamWriter AppendText()
CopyTo Method System.IO.FileInfo CopyTo(string destFileName), System.IO.FileInfo CopyTo(string destFileName, bool overwrite)
Create Method System.IO.FileStream Create()
CreateObjRef Method System.Runtime.Remoting.ObjRef CreateObjRef(type requestedType)
CreateText Method System.IO.StreamWriter CreateText()
Decrypt Method void Decrypt()
Delete Method void Delete()
Encrypt Method void Encrypt()
Equals Method bool Equals(System.Object obj)
GetAccessControl Method System.Security.AccessControl.FileSecurity GetAccessControl(), System.Security.AccessControl.FileSecurity GetAccessControl(System.Security.AccessControl.AccessControlSections includeSections)
GetHashCode Method int GetHashCode()
GetLifetimeService Method System.Object GetLifetimeService()
GetObjectData Method void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context), void ISerializable.GetObjectData(System.Runtime.Serialization.Se...
GetType Method type GetType()
InitializeLifetimeService Method System.Object InitializeLifetimeService()
MoveTo Method void MoveTo(string destFileName)
Open Method System.IO.FileStream Open(System.IO.FileMode mode), System.IO.FileStream Open(System.IO.FileMode mode, System.IO.FileAccess access), System.IO.FileStream Open(System.IO.FileMode mode, System.I...
OpenRead Method System.IO.FileStream OpenRead()
OpenText Method System.IO.StreamReader OpenText()
OpenWrite Method System.IO.FileStream OpenWrite()
Refresh Method void Refresh()
Replace Method System.IO.FileInfo Replace(string destinationFileName, string destinationBackupFileName), System.IO.FileInfo Replace(string destinationFileName, string destinationBackupFileName, bool ignoreMe...
SetAccessControl Method void SetAccessControl(System.Security.AccessControl.FileSecurity fileSecurity)
ToString Method string ToString()
PSChildName NoteProperty string PSChildName=test.csv
PSDrive NoteProperty PSDriveInfo PSDrive=C
PSIsContainer NoteProperty bool PSIsContainer=False
PSParentPath NoteProperty string PSParentPath=Microsoft.PowerShell.Core\FileSystem::C:\test
PSPath NoteProperty string PSPath=Microsoft.PowerShell.Core\FileSystem::C:\test\test.csv
PSProvider NoteProperty ProviderInfo PSProvider=Microsoft.PowerShell.Core\FileSystem
Attributes Property System.IO.FileAttributes Attributes {get;set;}
CreationTime Property datetime CreationTime {get;set;}
CreationTimeUtc Property datetime CreationTimeUtc {get;set;}
Directory Property System.IO.DirectoryInfo Directory {get;}
DirectoryName Property string DirectoryName {get;}
Exists Property bool Exists {get;}
Extension Property string Extension {get;}
FullName Property string FullName {get;}
IsReadOnly Property bool IsReadOnly {get;set;}
LastAccessTime Property datetime LastAccessTime {get;set;}
LastAccessTimeUtc Property datetime LastAccessTimeUtc {get;set;}
LastWriteTime Property datetime LastWriteTime {get;set;}
LastWriteTimeUtc Property datetime LastWriteTimeUtc {get;set;}
Length Property long Length {get;}
Name Property string Name {get;}
BaseName ScriptProperty System.Object BaseName {get=if ($this.Extension.Length -gt 0){$this.Name.Remove($this.Name.Length - $this.Extension.Length)}else{$this.Name};}
VersionInfo ScriptProperty System.Object VersionInfo {get=[System.Diagnostics.FileVersionInfo]::GetVersionInfo($this.FullName);}